自定义web.config节点 实现ConfigurationElemen

using  System;
using  System.Data;
using  System.Configuration;
using  System.Linq;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.HtmlControls;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Xml.Linq;

///   <summary>
///  Summary description for MyElement
///   </summary>
public   class  MyElement : ConfigurationElement
{
     public  MyElement()
    {
         //
         //  TODO: Add constructor logic here
         //
    }
    [ConfigurationProperty( " userName " ,IsRequired = true )]
     public   string  UserName
    {
         get  {  return  ( string ) this [ " userName " ]; }
         set  {  this [ " userName " ]  =  value; }
    }
    [ConfigurationProperty( " userPwd " )]
     public   string  UserPwd
    {
         get  {  return  ( string ) this [ " userPwd " ]; }
         set  {  this [ " userPwd " ]  =  value; }
    }
}
public   class  MyElementCollection : ConfigurationElementCollection
{
    
     public  MyElementCollection()
    {
        MyElement element  =  CreateNewElement()  as  MyElement;
    }
     protected   override  ConfigurationElement CreateNewElement()
    {
         return   new  MyElement();
    }

     protected   override   object  GetElementKey(ConfigurationElement element)
    {
         return  ((MyElement)element).UserName;
    }
     protected   override   void  BaseAdd(ConfigurationElement element)
    {
         base .BaseAdd(element, false );
    }
     public   void  Add(MyElement element)
    {
        BaseAdd(element);
    }
}
public   class  MyConfigSection : ConfigurationSection
{
    
        MyElement element;

         public  MyConfigSection()
        {
            element  =   new  MyElement();
        }

        [ConfigurationProperty( " files " )]
         public  MyElementCollection FileTypes
        {
             get
            {
                MyElementCollection types  =  (MyElementCollection) base [ " files " ];
                 return  types;
            }
        }

         protected   override   void  DeserializeSection(System.Xml.XmlReader reader)
        {
             base .DeserializeSection(reader);
        }

         protected   override   string  SerializeSection(ConfigurationElement parentElement,  string  name, ConfigurationSaveMode saveMode)
        {
             return   base .SerializeSection(parentElement, name, saveMode);
        }

}

     < section  name ="MyConfigS"  type ="MyConfigSection" />
</ configSections >

     protected   void  Button1_Click( object  sender, EventArgs e)
    {
        Configuration config  =  WebConfigurationManager.OpenWebConfiguration( " ~ " );
        MyConfigSection files  =  config.Sections[ " MyConfigS " ]  as  MyConfigSection;
        MyElement obj  =   new  MyElement();
        obj.UserName  =   " sdf " ;
        obj.UserPwd  =   " sdf " ;
        files.FileTypes.Add(obj);
        config.Save();
    }